create a function of a set of integers and a value for which you need to find the nearest one.

def nearest(numbers, value):
    small = []
    large = []
    
    for i in numbers:
        if i < value:
            small.append(i)
        else:
            large.append(i)

    if large and small:
        return max(small) if value - max(small) <= min(large) - value else min(large)
    return max(small) or min(large)

def main():
    numbers = [1, 2, 3, 4, 5, 6, 7, 8, 9]
    value = 6
    print(nearest(numbers, value))

main()